Public bug reported:
I noticed on a system that accepts large numbers of SSH connections that
after awhile, SSH sessions were taking ~25 seconds to complete.
Looking in /var/log/auth.log, systemd-logind starts failing with the
following:
Jun 10 23:55:28 test sshd[3666]: pam_unix(sshd:session): session opened for
user ubuntu by (uid=0)
Jun 10 23:55:28 test systemd-logind[105]: New session c1052 of user ubuntu.
Jun 10 23:55:28 test systemd-logind[105]: Failed to abandon session scope:
Transport endpoint is not connected
Jun 10 23:55:28 test sshd[3666]: pam_systemd(sshd:session): Failed to create
session: Message recipient disconnected from message bus without replying
I reproduced this in an LXD container by doing something like:
lxc launch ubuntu:x test
lxc exec test -- login -f ubuntu
ssh-import-id <whatever>
Then ran a script as follows (passing in ubuntu@<container-ip>):
while [ 1 ]; do
(time ssh $1 "echo OK > /dev/null") 2>&1 | grep ^real >> log
done
In my case, after 1052 logins, the 1053rd and thereafter were taking 25+
seconds to complete. Here are some snippets from the log file:
$ cat log | grep 0m0 | wc -l
1052
$ cat log | grep 0m25 | wc -l
4
$ tail -5 log
real 0m0.222s
real 0m25.232s
real 0m25.235s
real 0m25.236s
real 0m25.239s
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: systemd 229-4ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Sat Jun 11 00:09:34 2016
MachineType: Notebook W230SS
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash
SourcePackage: systemd
SystemdDelta:
[EXTENDED] /lib/systemd/system/rc-local.service →
/lib/systemd/system/rc-local.service.d/debian.conf
[EXTENDED] /lib/systemd/system/systemd-timesyncd.service →
/lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf
2 overridden configuration files found.
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: W230SS
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/15/2014:svnNotebook:pnW230SS:pvrNotApplicable:rvnNotebook:rnW230SS:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
dmi.product.name: W230SS
dmi.product.version: Not Applicable
dmi.sys.vendor: Notebook
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug uec-images xenial
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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1591411
Title:
systemd-logind must be restarted every ~1000 SSH logins to prevent a
~25 second delay
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